Roof drain



April 3, 1956 A. MATHEls 2,740,490

ROOF DRAIN Filed Aug. 30, 1952 ZF 4 f W 22 A wings 26 'G7 INVENTOR.

Aaron Mafheis United States Patent O "ice ROOF DRAIN Aaron Matheis, Montclair, N. J., assignor to Josam Manufacturing Company Application August 30, 1952, Serial No. 307,195

z claims. (c1. 18a-s1) The present invention relates to improvements in roof drains.

A commonly used type of roof drain comprises a basin extending through an opening cut in the roof deck planking, a basin flange resting upon the roof deck, a basin outlet to which drain piping is connected by a threaded or caulked joint, and suitable clamping means by which the flashing or top layers of the roofing sheets are sealed to the drain. In the roof drains of the prior art where an external caulk pipe joint is used, difiiculty has often been encountered in caulking the drain basin outlet to drainage piping of the building due to the close working space available beneath the roof deck. Extending the basin outlet structure downwardly to give sufficient clearance or working space for caulking operations results in a large and cumbersome drain fixture, and furthermore in high cost for the fixture. or internally caulked joint is used with the basin external to the pipe, after a period of time leaks often develop due to weatheringat the joint or other causes. The present invention is directed to a roof drain fixture adapted to a threaded joint, or an interior canlk joint which may be caulked from above the roof deck, wherein a joint shrouding and protecting means is provided.

The drawing shows a vertical substantially axial section through the drain of this invention in the enviroment of use.

In the drawing, D represents the planking of the roof deck with an opening therethrough to receive the drain basin, R the multiple layers of water proofing material with which the roof deck is overlaid, B the basin of a roof drain extending downwardly through the opening in the roof deck, P the drain piping connected to the basin, F a circumferential flange at the upper end of the basin resting on the roof deck, G a flashing clamp for sealing the top layer of roofing material to the top surface of flange F, and S a dome shaped strainer resting on the top of the flashing clamp. The cylindrical portion 11 of the basin B is provided at its lower end with an internal shoulder 12, which may be provided with threads for engaging the piping P, or as shown in the drawing, to retain caulking material for a caulked joint comprising bottom and top layers of oakurn and poured lead or like materials which may be applied to the joint in the usual manner during construction operations.

The under side of the flange F includes a shoulder portion which may fit within the opening in the decking, and a portion outwardly thereof having a circumferential groove 16, providing in effect an annular rim 17 to be set in roof mastic, the outer periphery-adjacent surfaces of the deck flange F and of the deck planking D being smeared with mastic, with the excess flowing up into groove 16. By means of the centrally apertured deck clamping plate 18 disposed about the cylindrical portion of the basin on the underside of the decking D, the studs 19 threaded into the flange shoulder 10 and extending through the plate 18, and the clamping Where a threaded l 2,740,490 Patented Apr. 3, 1956 nuts 20 thedrain flange F maybe drawn down tightly to hold the drain basin in place and form a water-tight seal of the deck frange. In that manner these layers .ofi

roofing, so applied supplement the water-tight seal between roof drain and deck planking and .extend over the entire deck area. inwardly over the periphery of the fiange F are similarly laid in and mopped with hot tar directly on top of the lower layers. In that position they augment the water-tight seal produced by the lower layers. Further, the edges of the top layers which extend inwardly over the periphery of flange F are held in sealed relation thereto by the clamping bolts 24 extending through the lugs 23 and threaded into flange F. A vertical rim near the outer periphery of the clamping ring base 22 is slotted to provide a plurality of vertical projections 25 spaced from each other to form a gravel stop ring with V-shaped drainage notches around the edge of the dome shaped drain screen S resting on the ring base 22. On opposite sides of the dashing clamping ring, a pair of these projections 25 may be threaded to receive retaining screws 26 extending inwardly to engage the screen or strainer rim 27.

Within the basin or wall B there is provided a cylindrical joint shroud 30, the lower end of which extends into the drain piping P and the upper end of which is provided with a circumferential flange 31, the edge of which is grooved to receive ring packing or gasket 32 for seaiing the upper end of the shroud to a supporting' basin respectively and clamping screws 37 threaded into the pressure ring to bear endwise upon the shroud flange. Caulking 38 such as mastic or similar material may be applied as a water proofing seal between the upper surface of the shroud flange and the basin B.

By the shroud structure provided in the drain of this invention water is introduced into the drain pipe at a point beyond the joint so that water does not come in contact with the joint. The joint is therefore protected from the action of flowing water and from weathering. Hence the use of an inside joint whether threaded or caulked is feasible, a point of particular advantage with a caulked joint since the interior caulked joint may be made from the roof with the strainer removed, thereby obviating the difficulties encountered by the use of an external caulked joint. The several clamping and sealing structures also contribute to ease in installation in a water-tight manner.

I claim: i

l. In a roof drain fixture a anged basin type drain body having a flange adapted to be sealed to the top surface of the roof sheathing structure, the basin structure comprising a depending cylindrical sleeve adapted to extend through the roof sheathing with the lower end thereof inwardly fianged to support a caulking joint adapted to connect the depending cylindrical portion of the drain body to a drain pipe, said cylindrical portion having an inwardly tapering shoulder formed in the top portion thereof, a joint shrouding cylindrical conduit disposed entirely within the depending cylindrical portion of the drain body and of less diameter than the depending The top layers of roofing extending i duit is sealed with sealing coinoound to the ocpendiog cylindricaLY portion of `the drainy bodyV References Cited in the le of this patent UNITED STATES PATENTS Schodde Apr. 4, 1911 Mueller July 23, 1912 Ryan V V Feb. 16, 1915 Goldman June 7, 1921 Hirshstein ..2 Aqg` 31,l 1937 Boosey May 14, 1946 Matheis ABioy@,18,1252 McDonald ,Man 16, `1954 

